One horror story could be when the nail polish doesn't dry properly. You think it's dry, then you accidentally touch something and it gets all smudged. Another is when the color turns out completely different from what you expected on your nails. It might look nice in the bottle but hideous on your nails.
There's no evidence to suggest that 'chanel nail polish fiction' is a new genre. Genres are defined by a set of common elements and themes that are widely shared among a body of works. 'chanel nail polish fiction' seems more like a specific and perhaps trendy topic that could be used in stories, but not a distinct genre. It lacks the broad - reaching and consistent set of characteristics that define a new genre.
One common horror story is when nail polish chips really fast. You just painted your nails all nice and then within a day or two, it starts looking all ragged. Another is when the color is not what you expected at all. You see it in the bottle as this beautiful shade but when it's on your nails, it's completely different.
Well, thinking about the Christmas story, angels are a big part of it. So for a Christmas nail design, you could do white angel wings on a blue background, representing the angels that announced the good news. You can also do a red and green color - block design with little crosses on some of the nails, symbolizing the sacrifice and the religious aspect of the Christmas story.